We recently scrapped our old Symbol APs in favor of 1142s with WiSMs. Unfortunately some of our older laptops with the Symbol Spectrum 24 LA-41x1 cards are having a very hard time getting a good connection with the Cisco gear in place. We've got the latest available symbol driver(circa 2004) and that does not seem to help. My best guess from the symptoms and the logs on the controllers is that the symbol card is not selecting the strongest AP signal, but rather the first it sees.
Symbol devices tend not to use CCX (aironet extensions), which causes problems when using Cisco APs. (I've even heard that they do this on purpose in hopes of people yanking Cisco APs for Symbol ones).
Try disabling CCX on the WLAN. Go to the WLAN tab, select your WLAN, and click the Advanced tab. Uncheck the Aironet IE box.
I think that's how it works in theory, but not always in practice. Sometimes using the extensions causes problems for the clients that don't support them. I have personally seen this specifically with Symbol devices more than once.
Cisco will recommend that you disable the extensions if you regularly use clients that don't support them.
I setup a separate SSID for diagnostics without CCX and there was no change. When I setup the SSID with no encryption, the signal was Excellent. When I added WPA-PSK with TKIP (but not AES and not WPA2-PSK like on production) it was also excellent.
Transferring Crash file from standby: Login to the Active WLC in HA.
From CLI: (Cisco Controller) >transfer upload datatype crash (Cisco
Controller) >transfer upload filename (Cisco
Controller) >transfer upload mode tftp (Cisco Controller) >transfer
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